Printing machines



Nov. 26, 1957 E. GERICKE 2,814,489

PRINTING MACHINES Filed Sept. 10, 1952 2 Sheets-Sheet 1 Inventor:-

Nov. 2 6, 1957 E. GERICKE 2,814,489

PRINTING MACHINES Filed Sept. 10, 1952 2 Shmeets-Sheet 2 Inventor: Ena er l/ Q United States Patent PRINTING MACHINES Erich Gericke, Bcrlin-Steglitz, Germany Application September 10, 1952, Serial No. 308,782

Claims priority, application Germany January 18, 1952 2 Claims. (Cl. 271--59) The invention relates to a pulling-mark for flat-printing machines, especially offset machines, in which the pulling head, which is provided with castors, stops and the like and which is displaceable on a guiding member that is arranged transversely of the direction of running of the sheet of paper, is periodically pressed on to a pulling bar which is arranged beneath the pulling head and carries out the pulling movement, in order to align the sheet of paper fed to the machine.

In pulling marks for fiat-printing machines, especially offset machines, which work, above the paper, with one or more castors and a fixed adjustable stop and in which the pulling head, that carries the rollers and the stop, is displaceably mounted on a shaft that is located transversely of the direction of running of the paper and is moved up and down by the rotation of the shaft, as well as in pulling marks in which the pulling head is mounted on a rail which carries out an up-and-down movement and, in this way, just as the former pulling mark, effects the setting of the rollers on the rail, which carries out the pulling movement, beneath the sheet to be aligned, it is possible to clean the pulling head only with loss of time and inconvenient manipulation.

The operation of the machine depends upon the carriage, which carries the castors and which are moved by fine, adjustable springs, not being hindered to the slightest extent by paper dust or other foreign bodies. SimilarIy, the stops which slide, without play, in the pulling head must be protected from being soiled in any way. It is therefore very frequently necessary to clean these parts.

The inaccessibility of the previous construction of this kind is due to the fact that the most accurate and, at the same time, the cheapest construction of a sliding movement and clamping on a shaft or rail of circular crosssection is possible and therefore cannot be removed.

According to the invention, it is proposed that the pulling-head part, which carries the rollers, stops or the like, should be detachably arranged on a clamping device which is displaceable on the guiding member. Preferably, the pulling-head part is displaceable on the clamping device in the direction of the guiding member and its detachment from the clamping device is effected by displacing it in the direction of the guiding member. According to the invention, the pulling-head part embraces the clamping device, preferably at a cylindrical part of the latter, and has an outwardly opening recess which, after the pulling-head part is detached from the clamping device, releases the pulling-head part from the clamping device.

An example of embodiment of the invention will now be described with the aid of the accompanying drawings, of which:

Figure 1 shows the pulling-mark device in front of the printing roller;

Figure 2 shows the pulling-mark device with the said part of the pulling head'mounted on the clamping device;

Figure 3 shows the pulling-mark device as seen from the side;

Figure 4 shows the pulling-mark device detached from the clamping device; and

Figure 5 is the same view as Figure 3 and shows the recess (1 by which the pulling-mark device is released from the guiding member, namely the rod e.

Ice

As shown in Figure l, the top sheet of the pile of sheets St is lifted by the suckers s and fed up to the front mark r. The suckers then return after this operation. The pullingmark head a has been lowered by the operation of the cam k, so that the castor f presses the sheet against the bar or rail 2 which carries out the pulling movement.

The sheet is taken along by the rail z until its edge touches the stop d of the pulling-mark head. The sheet remains in this position until the cylinder grippers (not shown) grasp it. In order [that it should be possible for the sheet to be taken along unhindered by the cylinder grippers, the pulling head is lifted from the sheet by the upward movement of the rod or guiding member.

In Figure 3, the pulling-mark device is shown as seen from the side. The pulling-head part a carries the delicate parts of the pulling-mark device, namely the caster ,f, the stops d and the corresponding springs. The pulling-head part a is mounted on a clamping device b, as shown in Figures 2 and 3. The clamping device has a cylindrical part and is displaceable on the guiding member, namely the rod e, and can be fixed, by means of the screw h at any desired position on the guiding member e that is moved up and down. The pulling-head part a embraces the cylindrical part of the clamping device, as shown in Figure 3. A screw g of the clamping device b is screwed into the pulling-head part a and the position of the pullinghead part a on the clamping device can be accurately adjusted by rotating the screw g. Thus, a coarse adjustment on the guiding member e is possible with this clamping device b by displacing the whole clamping device and fixing it by means of the screw h, and a fine adjustment of the pulling-head part a is also possible by means of the screw g.

As can be seen from Figures 4 and 5, the pulling-head part a can be pulled down from the clamping device b. The pulling-head part has a recess a which is of such a size that the guiding member e just passes through it. Consequently, on displacing the pulling-head part a axially, it leaves its position on the clamping device b and can be conveniently removed through the slot or recess a from its mounted position to any position on the thinner guide member. The pulling-head part, together with its sensitive parts which are subjected to cleaning, can therefore be taken off the guiding member without difiiculty and rinsed in a grease-dissolving liquid. The putting-011 of the pulling-head part is just as simple.

What I claim is:

1. A pulling-mark device on printing machines, especially offset machines, comprising a pulling bar, a pulling head having a roller and an abutment to cooperate with said pulling bar, an upwardly and downwardly displaceable shaft located transversely of the direction of movement of a paper sheet upon which said pulling head is movably mounted, a clamping device movable on said shaft, a tubular extension on said clamping device upon which said pulling head is seated and said pulling head having an outwardly open recess corresponding to the diameter of said shaft so that said pulling head is laterally removable from said shaft.

2. A pulling-mark device according to claim 1 wherein the position of the pulling head on the clamping device is adjustable by means of a screw interconnecting said head and clamping device.

References Cited in the file of this patent UNITED STATES PATENTS 650,709 Dexter May 29, 1900 912,544 Cross Feb. 16, 1909 1,404,376 Christophel Jan. 24, 1922 2,553,148 Rowlands May 15, 1951 2,553,758 Gegenheimer May 22, 1951 

